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  <h1 id="Kubernetes-故障解决心得"><a href="#Kubernetes-故障解决心得" class="headerlink" title="Kubernetes 故障解决心得"></a>Kubernetes 故障解决心得</h1><h3 id="故障现象"><a href="#故障现象" class="headerlink" title="故障现象"></a>故障现象</h3><p>kubelet 启动不了，通过命令 <code>journalctl -u kubelet</code> 查看日志，报 <code>Failed to start ContainerManager failed to initialize top level QOS containers: failed to update top level Burstable QOS cgroup : failed to set supported cgroup subsystems for cgroup [kubepods burstable]: failed to find subsystem mount for required subsystem: pids</code></p>
<h3 id="故障分析"><a href="#故障分析" class="headerlink" title="故障分析"></a>故障分析</h3><p>根据报错，有用的信息是 <code>failed to find subsystem mount for required subsystem: pids</code>，通过命令 <code>ls -l /sys/fs/cgroup/systemd/kubepods/burstable/</code> 查看，该目录下没有 <code>pids</code> 目录。</p>
<p><code>SupportPodPidsLimit</code> 在 kubernetes <code>1.14+</code> 默认开启。SupportNodePidsLimit 在<code>1.15+</code> 默认开启。</p>
<blockquote>
<p>相关Issues：<a target="_blank" rel="noopener" href="https://github.com/kubernetes/kubernetes/issues/79046">https://github.com/kubernetes/kubernetes/issues/79046</a></p>
</blockquote>
<h3 id="解决方法"><a href="#解决方法" class="headerlink" title="解决方法"></a>解决方法</h3><ul>
<li>方法一：编辑 kubelet 配置文件，添加 <code>--feature-gates=SupportPodPidsLimit=false,SupportNodePidsLimit=false</code> 参数，后面在重启 kubelet 服务。</li>
<li>方法二：可以升级系统内核 <code>5+</code> 版本</li>
</ul>
<h2 id="故障二"><a href="#故障二" class="headerlink" title="故障二"></a>故障二</h2><h3 id="故障现象-1"><a href="#故障现象-1" class="headerlink" title="故障现象"></a>故障现象</h3><p>Docker daemon oci 故障，日志报 <code>docker: Error response from daemon: OCI runtime create failed: container_linux.go:348: starting container process caused &quot;process_linux.go:301: running exec setns process for init caused \&quot;exit status 40\&quot;&quot;: unknown.</code></p>
<h3 id="解决方法-1"><a href="#解决方法-1" class="headerlink" title="解决方法"></a>解决方法</h3><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"># 清理缓存</span><br><span class="line">$ echo 1 &gt; &#x2F;proc&#x2F;sys&#x2F;vm&#x2F;drop_caches</span><br><span class="line"></span><br><span class="line"># 永久生效</span><br><span class="line">$ echo &quot;vm.min_free_kbytes&#x3D;1048576&quot; &gt;&gt; &#x2F;etc&#x2F;sysctl.conf</span><br><span class="line">$ sysctl -p</span><br><span class="line"></span><br><span class="line"># 重启 docker 服务，让 docker 应用内核设置</span><br><span class="line">$ systemctl restart docker</span><br></pre></td></tr></table></figure>

<h2 id="故障三"><a href="#故障三" class="headerlink" title="故障三"></a>故障三</h2><h3 id="报错现象"><a href="#报错现象" class="headerlink" title="报错现象"></a>报错现象</h3><p>kubelet 日志报 <code>network plugin is not ready: cni config uninitialized</code></p>
<h3 id="解决方法-2"><a href="#解决方法-2" class="headerlink" title="解决方法"></a>解决方法</h3><p>网络插件（flannel 或者 calico）没有安装或者安装失败。</p>
<h2 id="故障四"><a href="#故障四" class="headerlink" title="故障四"></a>故障四</h2><h3 id="故障现象-2"><a href="#故障现象-2" class="headerlink" title="故障现象"></a>故障现象</h3><p>kubelet 日志报 <code>Failed to connect to apiserver: the server has asked for the client to provide credentials</code></p>
<h3 id="故障分析-1"><a href="#故障分析-1" class="headerlink" title="故障分析"></a>故障分析</h3><p>从上面 kubelet 日志信息能得出，kubelet 客户端证书已过期，导致 Node节点状态处于 <code>NotReady</code>。</p>
<p>也可以通过命令 <code>openssl x509 -noout -enddate -in &#123;证书路径&#125;</code> 来查看证书到期日期。</p>
<h3 id="解决方法-3"><a href="#解决方法-3" class="headerlink" title="解决方法"></a>解决方法</h3><h4 id="kubeadm-部署的-Kubernetes-解决方法"><a href="#kubeadm-部署的-Kubernetes-解决方法" class="headerlink" title="kubeadm 部署的 Kubernetes 解决方法"></a>kubeadm 部署的 Kubernetes 解决方法</h4><p>kubernetes 1.15+ 版本可以直接通过命令 <code>kubeadm alpha certs renew </code> 更新。</p>
<p>kubernetes 小于 1.15 版本的，可以参考 <code>https://github.com/yuyicai/update-kube-cert</code> 项目更新</p>
<h4 id="二进制部署的-Kubernetes-解决方法"><a href="#二进制部署的-Kubernetes-解决方法" class="headerlink" title="二进制部署的 Kubernetes 解决方法"></a>二进制部署的 Kubernetes 解决方法</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"># 删除旧的 kubelet 证书文件</span><br><span class="line">$ rm -f  &#x2F;opt&#x2F;kubernetes&#x2F;ssl&#x2F;kubelet*</span><br><span class="line"></span><br><span class="line"># 删除 kubelet kubeconfig 文件</span><br><span class="line">$ rm -f &#x2F;opt&#x2F;kubernetes&#x2F;cfg&#x2F;kubelet.kubeconfig</span><br><span class="line"></span><br><span class="line"># 重启 kubelet 服务，让 master 重新颁发客户端证书</span><br><span class="line">$ systemctl restart kubelet</span><br></pre></td></tr></table></figure>

<h2 id="参考链接"><a href="#参考链接" class="headerlink" title="参考链接"></a>参考链接</h2><ul>
<li><a target="_blank" rel="noopener" href="https://adoyle.me/Today-I-Learned/k8s/k8s-deployment.html">https://adoyle.me/Today-I-Learned/k8s/k8s-deployment.html</a></li>
</ul>
<p>YP小站 发起了一个读者讨论大家可以在这里分享工作中或者学习中遇到的kubernetes故障。。。精选讨论内容参与讨论<img src="http://iubest.gitee.io/pic/132.jpg" alt="img">小站5写的非常不错，有很大收获。</p>
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<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/jquery-modal@0.9.2/jquery.modal.min.css">
<script src="https://cdn.jsdelivr.net/npm/justifiedGallery@3.7.0/dist/js/jquery.justifiedGallery.min.js"></script>

<script src="/dist/main.js"></script>

<!-- ImageViewer -->

<!-- Root element of PhotoSwipe. Must have class pswp. -->
<div class="pswp" tabindex="-1" role="dialog" aria-hidden="true">

    <!-- Background of PhotoSwipe. 
         It's a separate element as animating opacity is faster than rgba(). -->
    <div class="pswp__bg"></div>

    <!-- Slides wrapper with overflow:hidden. -->
    <div class="pswp__scroll-wrap">

        <!-- Container that holds slides. 
            PhotoSwipe keeps only 3 of them in the DOM to save memory.
            Don't modify these 3 pswp__item elements, data is added later on. -->
        <div class="pswp__container">
            <div class="pswp__item"></div>
            <div class="pswp__item"></div>
            <div class="pswp__item"></div>
        </div>

        <!-- Default (PhotoSwipeUI_Default) interface on top of sliding area. Can be changed. -->
        <div class="pswp__ui pswp__ui--hidden">

            <div class="pswp__top-bar">

                <!--  Controls are self-explanatory. Order can be changed. -->

                <div class="pswp__counter"></div>

                <button class="pswp__button pswp__button--close" title="Close (Esc)"></button>

                <button class="pswp__button pswp__button--share" style="display:none" title="Share"></button>

                <button class="pswp__button pswp__button--fs" title="Toggle fullscreen"></button>

                <button class="pswp__button pswp__button--zoom" title="Zoom in/out"></button>

                <!-- Preloader demo http://codepen.io/dimsemenov/pen/yyBWoR -->
                <!-- element will get class pswp__preloader--active when preloader is running -->
                <div class="pswp__preloader">
                    <div class="pswp__preloader__icn">
                        <div class="pswp__preloader__cut">
                            <div class="pswp__preloader__donut"></div>
                        </div>
                    </div>
                </div>
            </div>

            <div class="pswp__share-modal pswp__share-modal--hidden pswp__single-tap">
                <div class="pswp__share-tooltip"></div>
            </div>

            <button class="pswp__button pswp__button--arrow--left" title="Previous (arrow left)">
            </button>

            <button class="pswp__button pswp__button--arrow--right" title="Next (arrow right)">
            </button>

            <div class="pswp__caption">
                <div class="pswp__caption__center"></div>
            </div>

        </div>

    </div>

</div>

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/photoswipe@4.1.3/dist/photoswipe.min.css">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/photoswipe@4.1.3/dist/default-skin/default-skin.min.css">
<script src="https://cdn.jsdelivr.net/npm/photoswipe@4.1.3/dist/photoswipe.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/photoswipe@4.1.3/dist/photoswipe-ui-default.min.js"></script>

<script>
    function viewer_init() {
        let pswpElement = document.querySelectorAll('.pswp')[0];
        let $imgArr = document.querySelectorAll(('.article-entry img:not(.reward-img)'))

        $imgArr.forEach(($em, i) => {
            $em.onclick = () => {
                // slider展开状态
                // todo: 这样不好，后面改成状态
                if (document.querySelector('.left-col.show')) return
                let items = []
                $imgArr.forEach(($em2, i2) => {
                    let img = $em2.getAttribute('data-idx', i2)
                    let src = $em2.getAttribute('data-target') || $em2.getAttribute('src')
                    let title = $em2.getAttribute('alt')
                    // 获得原图尺寸
                    const image = new Image()
                    image.src = src
                    items.push({
                        src: src,
                        w: image.width || $em2.width,
                        h: image.height || $em2.height,
                        title: title
                    })
                })
                var gallery = new PhotoSwipe(pswpElement, PhotoSwipeUI_Default, items, {
                    index: parseInt(i)
                });
                gallery.init()
            }
        })
    }
    viewer_init()
</script>

<!-- MathJax -->

<!-- Katex -->

<!-- busuanzi  -->


<script src="/js/busuanzi-2.3.pure.min.js"></script>


<!-- ClickLove -->

<!-- ClickBoom1 -->

<!-- ClickBoom2 -->

<!-- CodeCopy -->


<link rel="stylesheet" href="/css/clipboard.css">

<script src="https://cdn.jsdelivr.net/npm/clipboard@2/dist/clipboard.min.js"></script>
<script>
  function wait(callback, seconds) {
    var timelag = null;
    timelag = window.setTimeout(callback, seconds);
  }
  !function (e, t, a) {
    var initCopyCode = function(){
      var copyHtml = '';
      copyHtml += '<button class="btn-copy" data-clipboard-snippet="">';
      copyHtml += '<i class="ri-file-copy-2-line"></i><span>COPY</span>';
      copyHtml += '</button>';
      $(".highlight .code pre").before(copyHtml);
      $(".article pre code").before(copyHtml);
      var clipboard = new ClipboardJS('.btn-copy', {
        target: function(trigger) {
          return trigger.nextElementSibling;
        }
      });
      clipboard.on('success', function(e) {
        let $btn = $(e.trigger);
        $btn.addClass('copied');
        let $icon = $($btn.find('i'));
        $icon.removeClass('ri-file-copy-2-line');
        $icon.addClass('ri-checkbox-circle-line');
        let $span = $($btn.find('span'));
        $span[0].innerText = 'COPIED';
        
        wait(function () { // 等待两秒钟后恢复
          $icon.removeClass('ri-checkbox-circle-line');
          $icon.addClass('ri-file-copy-2-line');
          $span[0].innerText = 'COPY';
        }, 2000);
      });
      clipboard.on('error', function(e) {
        e.clearSelection();
        let $btn = $(e.trigger);
        $btn.addClass('copy-failed');
        let $icon = $($btn.find('i'));
        $icon.removeClass('ri-file-copy-2-line');
        $icon.addClass('ri-time-line');
        let $span = $($btn.find('span'));
        $span[0].innerText = 'COPY FAILED';
        
        wait(function () { // 等待两秒钟后恢复
          $icon.removeClass('ri-time-line');
          $icon.addClass('ri-file-copy-2-line');
          $span[0].innerText = 'COPY';
        }, 2000);
      });
    }
    initCopyCode();
  }(window, document);
</script>


<!-- CanvasBackground -->


    
  </div>
</body>

</html>